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Calculate the standard enthalpy of reaction for reducing

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 95E Chapter 22

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 95E

Calculate the standard enthalpy of reaction for reducing the different forms of iron oxide to iron metal and CO2 from the reaction of the oxide with CO. Identify which reaction is the most exothermic per mole of iron and explain why.

a. Fe3O4 

b. FeO

c. Fe2O3

Step-by-Step Solution:

Solution:Step 1The chemical reaction for the reduction of iron oxide (Fe O ) to iron3et4 and CO into CO is , 2 (a) Fe3 4) + 4Co (g) 3Fe (s) +4CO (g) 2H reaction npH products npH reactants = [3 H Fe(s) 4 H CO(g) - [3 H Fe(s) 4H CO2(g) = [(3.0 ×0)KJ/mol + 4(-393.5)KJ/mol] -[(1.0 ×(-1117))KJ/mol + 4(-110.5)KJ/mol] = [-1574 KJ/mol] - [-1117 KJ/mol - 442.0 KJ/mol] = [-1574.0 KJ/mol+ 1559.0 KJ/mol] = -15 KJ/molThus enthalpy of reaction is -15 KJ/mol.Step-2(b) FeO(s) + CO (g) Fe(s) + CO (g) 2We know that H reaction npH products npH reactants = [1.0 H + 1.0 H ] - [1.0 H + 1.0 H ] Fe(s) CO2(g) FeO(s) CO(g) = [(1.0 ×0)KJ/mol + 1.0(-393.5)KJ/mol] -[(1.0 ×(-272))KJ/mol + 1.0(-11o.5)KJ/mol] = [-393.5 KJ/mol] - [-272 KJ/mol - 110.5 KJ/mol] = [-393.5 KJ/mol+ 382.5 KJ/mol] = -11KJ/molThus enthalpy of reaction is -11KJ/mol.Step 3 Fe O (s) + 3Co (g) 2Fe (s) +3CO (g) 2 3 2 H reaction npH products npH reactants = [2.0 H Fe(s)3.0 H CO2(g)- [1.0 H Fe2O3(s) 3.0 H CO(g) = [(2.0 ×0)KJ/mol + 3.0(-393.5)KJ/mol] -[(1.0 ×(-826))KJ/mol + 3.0(-110.5)KJ/mol] = [-1180.5 KJ/mol] - [-826 KJ/mol - 331.5 KJ/mol] = [-1180.5 KJ/mol+ 1157.5 KJ/mol] = -23KJ/mol\nThus enthalpy of reaction is -23 KJ/mol.Step 4Fe2 3 the most exothermic because it has the highest oxidation state .

Step 2 of 3

Chapter 22, Problem 95E is Solved
Step 3 of 3

Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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